Overview of the development of fine blanking dies

    Fine blanking die technology in China, "during" has made considerable progress, and fine blanking technology, materials, fine blanking presses,  mold, and lubrication and achieved a series of scientific research. As of the end of 2008, nearly 20 provinces of China with professional production equipment, fine blanking, fine blanking presses a total of more than 80 units (excluding hydraulic mold), employing more than 5,000 fine blanking, fine blanking parts produced about 2,000, and has formed a number of self-development model base fine blanking dies. Extend from the non-ferrous metal to black metal stamping punching. Low-carbon steel, low alloy steel and stainless steel blanking thickness of 12mm; non-ferrous metals such as aluminum and copper alloy blanking thickness up to 18mm; with the mold material and processing method of progress and the ball was washed plate processing process improvement and the popularity of some of the hard high-carbon steel, high alloy steel and other low-ductile materials such as nickel or cobalt-based alloy materials have begun for the production of fine blanking parts. In addition, the independent development of complex precision progressive dies, transfer mode, and modularity in the country die in the proportion of fine blanking mold significantly increased, especially for automotive transmission parts of the complex compound fine progressive dies, basically localized. Fine-blanking process for forming the finite element numerical simulation, structural optimization technology fine blanking die, Fine blanking die intelligent design and knowledge base technology research, development and application, to enhance and enrich our technical content of fine blanking dies. However, the current fine blanking enterprises are generally small, scattered resources, low productivity, shortage of talents and supporting incomplete. Although the development of fine blanking die with a certain amount of development capacity, but in a complex fine blanking dies, fine blanking, especially the development of composite forming die is still a lack of experience, imports still account for a large proportion of the mold. 

    Overall, our level of fine blanking technology and tooling and advanced countries (eg Switzerland) compared to the gaps still exist, such as fine blanking technology in manufacturing applications also is not popular, mold design and manufacturing technology and systems theory, fine impulse-related equipment, fine blanking oil, process and measurement equipment such as a difference greater is the need to vigorously promote and develop the die technology. 

    

    With the international advanced level of the main gap 

    1. Fine blanking die life 

Precision blanking die at home and abroad The main difference is the low life. Fine blanking die developed countries life expectancy is generally a sharpening steel materials are more than 40,000 times, hundreds of thousands of die total life times. Foreign country only 50%. Outstanding issues affect the die life is the quality of the mold materials and heat treatment, precision die because the current price is too expensive imported mold steel, in the case of production is not large, the majority still use the steel-made mold. And material well-made tool steel, forging and heat treatment process with control and instability lead to an overall quality of life very different mold. 

    2. Fine red material 

    Fine red material is fine blanking technology, the core element of the required materials, fine red uniform and the hardness of the material medium. To achieve this goal, the ball should be carried out before the fine blanking annealing, the rate of the ball to reach more than 95%; while most of the material difficult to meet domestic requirements, the ball ball annealing rate of only 50% ~ 90%. For mold material, the current basic aspects of mold material can be achieved in cutting fine blanking requirements, but the extrusion, mold material of high strength and high toughness can not meet the requirements. Domestic fine blanking plate material properties (chemical composition and mechanical properties), and tolerance than the imported materials such as poor. In addition, because the requirements of the production volume amounted to less than a steel material procurement requirements of the "minimum volume", and thus had to pay high prices or long-term raw materials imported from abroad. These factors lead to rising costs of fine-blanking parts, forcing many companies to use ordinary or simple fine blanking plate to replace the fine blanking products, the impact of the fine blanking products market. In addition, advanced materials, national studies have been fine red material from ordinary materials to the development of high-strength fine-blanking, the tensile strength to 900N/mm2. Fine blanking of high hardness materials has become possible. 

    3. Fine blanking die design 

    In order to improve production efficiency, international fine die has been continuously dominated by more than 70%, productivity has been up to 100 / min, fine blanking parts to reach millions of zero-defect quality. China now has some fine blanking die design and development capabilities. However, the current complexity of the domestic industry in the fine blanking Fine blanking die, especially the fine blanking compound forming die design and development is still a lack of experience, some companies on specific products have a certain amount of technology accumulation, but in general and advanced level is still There is a big gap. With the domestic rate of less than 80% since, including an oversupply of middle and low mold, with the rate of high-grade die from less than 60%. In addition, compared with foreign and domestic life of the mold is generally low, usually abroad, 1 / 3. Reasons related to fine blanking die design, materials, fine blanking, fine blanking mold material, mold manufacturing precision fine blanking, fine blanking machine precision, oil, and fine blanking manufacturing processes of systematic and so on. 

    4. The manufacture of fine blanking dies 

    Precision die manufacturing process of the international community has accumulated a large amount of proprietary technology, especially the century-old plant, technology accumulation has reached expert level. Sperm die in the domestic accumulation of very few proprietary technology, there is still a long way to go. In addition, Fine blanking die mold surface quality of the performance and service life is crucial, especially luxury cars drive and transmission system of complex, high precision fine blanking parts of the mold, the mold cavity in the domestic technology has begun to surface treatment attention, but in this area of ​​technology and advanced countries there is a clear gap. 

    5. Stamping die design analysis 

    Fine-blanking process for forming foreign finite element numerical simulation and die stress analysis simulation of fine blanking checking technology has reached a high level of research and has been used in fine blanking die design checking and design verification, optimization of die structure and so on. Although some domestic universities and research institutes have been carried out in this basic research, but research in these technology areas, there are some gaps. 

    6. Basic research team in 

    Since the inception of fine blanking technology, fine blanking has its unique way of attracting the plastic forming the attention of scholars, now part of the universities and research institutes to maintain a more comprehensive, in-depth process of fine blanking technology research with the mold, but with the international advanced level there is still a large gap in the international arena, Switzerland FEINTOOL fine blanking company initiated a joint research consortium of universities five research institutions, the Swiss Federal Institute of Technology Zurich, Institute of Virtual Manufacturing (ETHZurich), University of Aachen, Germany Machine Tool Research Institute (RWTHAachen), University of Munich, Germany, Institute of Metal Forming and Casting (TUMunich), Ohio State University (OSU) and the China Shanghai Jiaotong University, is more active on the international fine blanking technology research team. 

    7. Standardization of mold 

    Common international standards of fine blanking die Association of German Engineers is standard VDI3345 (Feinschneiden). Fine blanking leading foreign companies, such as (FEINTOOL) Corporation (VDI3345 major development units) in the VDI 3345 standard on the basis of the formation of the enterprise, and part of the public. At present, China mainly fine blanking company based VDI3345 corporate standards and related standards. In order to enhance our fine blanking mold industry as a whole, promote the development of industry standards in integrated internationally accepted standards and fine blanking die mold industry in China fine blanking the actual circumstances, the development of China Fine blanking die national or industry standards is very important. 

    8. Fineblanking equipment 

    Abroad, fine blanking and fine blanking technology equipment, the simultaneous development of a few hundred years, especially from Switzerland Finetool company, the industry has been in the forefront of fine blanking, fine blanking of its equipment, technology and ancillary accessories and fine blanking technology in the world's leading oil level. In recent years, Japan has gradually refined the rise of washed equipment, occupy a large part of fine-blanking device mid-market, and China in this regard is still blank. 

    Development targets and major tasks for the future 

    Fine blanking die of China's future development goals for the domestic market demand fine-blanking parts, die design and manufacture of precision from the start straight, fine blanking dies to enhance the size of the industry, continues to expand manufacturing capacity, increased complexity in the fine blanking mold self-development capacity, digital Fine blanking die level of research, development and fine blanking mold material and the rational use of fine blanking die surface treatment technology has made significant progress in efforts to improve the level of precision die technology, to narrow the gap with the international advanced level, so that access to the domestic fine blanking parts wider application. 

    Future product and technology development priorities and major issues 

    1. Continuous complex parts design and manufacture of precision die key technologies 

    Continuous refinement of complex parts is fine blanking die cutting edge technology, basic technology, as a leading a study, expected to drive our entire fine blanking technology has increased significantly. The synchronizer ring, clutch disc and continuous vertical compound fine blanking technology and continuous refinement of complex parts such as mold die as a breakthrough, mold design and manufacturing of fine blanking key technologies to achieve our fine blanking dies rapid technological upgrading, as soon as possible to shorten with the advanced countries gap. 

    2. Fine blanking die life and its related key technologies to enhance 

    Die life is a mold material, process, and supporting a comprehensive reflection of the level of the product, Fine blanking die life to start as the leading technology research, not only can solve the urgent domestic problem of low precision die life, can also promote mold material, fine blanking process and supporting tooling and other ancillary products of technological development. 

    3. Fine Blanking - forging composite technology research and development 

    Fine blanking, forging is the parallel development of two advanced manufacturing technology, fine blanking parts too thick and need to forging, precision forgings too thin to be fine-blanking, the two interrelated, closely related. Development of precision forging - fine blanking compound technology the basic idea is to find the point of integration of these two processes (such as the pulley hub gear with a short axis of the cam parts and components), and the forging of China have a long history, has a very high level , and in order to improve China's overall level of fine blanking technology is a good way.